diff --git a/components.d.ts b/components.d.ts
index 8c75790d..caaa50a6 100644
--- a/components.d.ts
+++ b/components.d.ts
@@ -67,6 +67,7 @@ declare module '@vue/runtime-core' {
     RouterView: typeof import('vue-router')['RouterView']
     SearchBar: typeof import('./src/components/SearchBar.vue')['default']
     SearchBarItem: typeof import('./src/components/SearchBarItem.vue')['default']
+    SpanCopyable: typeof import('./src/components/SpanCopyable.vue')['default']
     TextareaCopyable: typeof import('./src/components/TextareaCopyable.vue')['default']
     ToolCard: typeof import('./src/components/ToolCard.vue')['default']
   }
diff --git a/src/tools/ipv4-subnet-calculator/copyable-ip-like.vue b/src/components/SpanCopyable.vue
similarity index 69%
rename from src/tools/ipv4-subnet-calculator/copyable-ip-like.vue
rename to src/components/SpanCopyable.vue
index 5069b870..caac35d0 100644
--- a/src/tools/ipv4-subnet-calculator/copyable-ip-like.vue
+++ b/src/components/SpanCopyable.vue
@@ -1,7 +1,7 @@
 <template>
   <n-tooltip trigger="hover">
     <template #trigger>
-      <span class="ip" @click="handleClick">{{ ip }}</span>
+      <span class="value" @click="handleClick">{{ value }}</span>
     </template>
     {{ tooltipText }}
   </n-tooltip>
@@ -11,13 +11,13 @@
 import { useClipboard } from '@vueuse/core';
 import { ref, toRefs } from 'vue';
 
-const props = withDefaults(defineProps<{ ip?: string }>(), { ip: '' });
-const { ip } = toRefs(props);
+const props = withDefaults(defineProps<{ value?: string }>(), { value: '' });
+const { value } = toRefs(props);
 
 const initialText = 'Copy to clipboard';
 const tooltipText = ref(initialText);
 
-const { copy } = useClipboard({ source: ip });
+const { copy } = useClipboard({ source: value });
 
 function handleClick() {
   copy();
@@ -28,8 +28,8 @@ function handleClick() {
 </script>
 
 <style scoped lang="less">
-.ip {
-  font-family: monospace;
+.value {
   cursor: pointer;
+  font-family: monospace;
 }
 </style>
diff --git a/src/tools/index.ts b/src/tools/index.ts
index ad6167e1..016286c2 100644
--- a/src/tools/index.ts
+++ b/src/tools/index.ts
@@ -1,6 +1,7 @@
 import { tool as base64FileConverter } from './base64-file-converter';
 import { tool as base64StringConverter } from './base64-string-converter';
 import { tool as basicAuthGenerator } from './basic-auth-generator';
+import { tool as ipv4RangeExpander } from './ipv4-range-expander';
 import { tool as httpStatusCodes } from './http-status-codes';
 import { tool as yamlToJson } from './yaml-to-json-converter';
 import { tool as jsonToYaml } from './json-to-yaml-converter';
@@ -111,7 +112,7 @@ export const toolsByCategory: ToolCategory[] = [
   },
   {
     name: 'Network',
-    components: [ipv4SubnetCalculator, ipv4AddressConverter, macAddressLookup, ipv6UlaGenerator],
+    components: [ipv4SubnetCalculator, ipv4AddressConverter, ipv4RangeExpander, macAddressLookup, ipv6UlaGenerator],
   },
   {
     name: 'Math',
diff --git a/src/tools/ipv4-range-expander/index.ts b/src/tools/ipv4-range-expander/index.ts
new file mode 100644
index 00000000..233f7cc4
--- /dev/null
+++ b/src/tools/ipv4-range-expander/index.ts
@@ -0,0 +1,13 @@
+import { UnfoldMoreOutlined } from '@vicons/material';
+import { defineTool } from '../tool';
+
+export const tool = defineTool({
+  name: 'IPv4 range expander',
+  path: '/ipv4-range-expander',
+  description:
+    'Given a start and an end IPv4 address this tool calculates a valid IPv4 network with its CIDR notation.',
+  keywords: ['ipv4', 'range', 'expander', 'subnet', 'creator', 'cidr'],
+  component: () => import('./ipv4-range-expander.vue'),
+  icon: UnfoldMoreOutlined,
+  createdAt: new Date('2023-04-19'),
+});
diff --git a/src/tools/ipv4-range-expander/ipv4-range-expander.e2e.spec.ts b/src/tools/ipv4-range-expander/ipv4-range-expander.e2e.spec.ts
new file mode 100644
index 00000000..ae5188e5
--- /dev/null
+++ b/src/tools/ipv4-range-expander/ipv4-range-expander.e2e.spec.ts
@@ -0,0 +1,32 @@
+import { test, expect } from '@playwright/test';
+
+test.describe('Tool - IPv4 range expander', () => {
+  test.beforeEach(async ({ page }) => {
+    await page.goto('/ipv4-range-expander');
+  });
+
+  test('Has correct title', async ({ page }) => {
+    await expect(page).toHaveTitle('IPv4 range expander - IT Tools');
+  });
+
+  test('Calculates correct for valid input', async ({ page }) => {
+    await page.getByPlaceholder('Start IPv4 address...').fill('192.168.1.1');
+    await page.getByPlaceholder('End IPv4 address...').fill('192.168.7.255');
+
+    expect(await page.getByTestId('start-address.old').textContent()).toEqual('192.168.1.1');
+    expect(await page.getByTestId('start-address.new').textContent()).toEqual('192.168.0.0');
+    expect(await page.getByTestId('end-address.old').textContent()).toEqual('192.168.7.255');
+    expect(await page.getByTestId('end-address.new').textContent()).toEqual('192.168.7.255');
+    expect(await page.getByTestId('addresses-in-range.old').textContent()).toEqual('1,791');
+    expect(await page.getByTestId('addresses-in-range.new').textContent()).toEqual('2,048');
+    expect(await page.getByTestId('cidr.old').textContent()).toEqual('');
+    expect(await page.getByTestId('cidr.new').textContent()).toEqual('192.168.0.0/21');
+  });
+
+  test('Hides result for invalid input', async ({ page }) => {
+    await page.getByPlaceholder('Start IPv4 address...').fill('192.168.1.1');
+    await page.getByPlaceholder('End IPv4 address...').fill('192.168.0.255');
+
+    await expect(page.getByTestId('result')).not.toBeVisible();
+  });
+});
diff --git a/src/tools/ipv4-range-expander/ipv4-range-expander.service.test.ts b/src/tools/ipv4-range-expander/ipv4-range-expander.service.test.ts
new file mode 100644
index 00000000..66a9137a
--- /dev/null
+++ b/src/tools/ipv4-range-expander/ipv4-range-expander.service.test.ts
@@ -0,0 +1,21 @@
+import { expect, describe, it } from 'vitest';
+import { calculateCidr } from './ipv4-range-expander.service';
+
+describe('ipv4RangeExpander', () => {
+  describe('when there are two valid ipv4 addresses given', () => {
+    it('should calculate valid cidr for given addresses', () => {
+      const result = calculateCidr({ startIp: '192.168.1.1', endIp: '192.168.7.255' });
+
+      expect(result).toBeDefined();
+      expect(result?.oldSize).toEqual(1791);
+      expect(result?.newSize).toEqual(2048);
+      expect(result?.newStart).toEqual('192.168.0.0');
+      expect(result?.newEnd).toEqual('192.168.7.255');
+      expect(result?.newCidr).toEqual('192.168.0.0/21');
+    });
+
+    it('should return empty result for invalid input', () => {
+      expect(calculateCidr({ startIp: '192.168.7.1', endIp: '192.168.6.255' })).not.toBeDefined();
+    });
+  });
+});
diff --git a/src/tools/ipv4-range-expander/ipv4-range-expander.service.ts b/src/tools/ipv4-range-expander/ipv4-range-expander.service.ts
new file mode 100644
index 00000000..893b1d32
--- /dev/null
+++ b/src/tools/ipv4-range-expander/ipv4-range-expander.service.ts
@@ -0,0 +1,63 @@
+import type { Ipv4RangeExpanderResult } from './ipv4-range-expander.types';
+import { convertBase } from '../integer-base-converter/integer-base-converter.model';
+import { ipv4ToInt } from '../ipv4-address-converter/ipv4-address-converter.service';
+export { calculateCidr };
+
+function bits2ip(ipInt: number) {
+  return (ipInt >>> 24) + '.' + ((ipInt >> 16) & 255) + '.' + ((ipInt >> 8) & 255) + '.' + (ipInt & 255);
+}
+
+function getRangesize(start: string, end: string) {
+  if (start == null || end == null) return -1;
+
+  return 1 + parseInt(end, 2) - parseInt(start, 2);
+}
+
+function getCidr(start: string, end: string) {
+  if (start == null || end == null) return null;
+
+  const range = getRangesize(start, end);
+  if (range < 1) {
+    return null;
+  }
+
+  let mask = 32;
+  for (let i = 0; i < 32; i++) {
+    if (start[i] !== end[i]) {
+      mask = i;
+      break;
+    }
+  }
+
+  const newStart = start.substring(0, mask) + '0'.repeat(32 - mask);
+  const newEnd = end.substring(0, mask) + '1'.repeat(32 - mask);
+
+  return { start: newStart, end: newEnd, mask: mask };
+}
+
+function calculateCidr({ startIp, endIp }: { startIp: string; endIp: string }) {
+  const start = convertBase({
+    value: ipv4ToInt({ ip: startIp }).toString(),
+    fromBase: 10,
+    toBase: 2,
+  });
+  const end = convertBase({
+    value: ipv4ToInt({ ip: endIp }).toString(),
+    fromBase: 10,
+    toBase: 2,
+  });
+
+  const cidr = getCidr(start, end);
+  if (cidr != null) {
+    const result: Ipv4RangeExpanderResult = {};
+    result.newEnd = bits2ip(parseInt(cidr.end, 2));
+    result.newStart = bits2ip(parseInt(cidr.start, 2));
+    result.newCidr = result.newStart + '/' + cidr.mask;
+    result.newSize = getRangesize(cidr.start, cidr.end);
+
+    result.oldSize = getRangesize(start, end);
+    return result;
+  }
+
+  return undefined;
+}
diff --git a/src/tools/ipv4-range-expander/ipv4-range-expander.types.ts b/src/tools/ipv4-range-expander/ipv4-range-expander.types.ts
new file mode 100644
index 00000000..9172fed0
--- /dev/null
+++ b/src/tools/ipv4-range-expander/ipv4-range-expander.types.ts
@@ -0,0 +1,7 @@
+export type Ipv4RangeExpanderResult = {
+  oldSize?: number;
+  newStart?: string;
+  newEnd?: string;
+  newCidr?: string;
+  newSize?: number;
+};
diff --git a/src/tools/ipv4-range-expander/ipv4-range-expander.vue b/src/tools/ipv4-range-expander/ipv4-range-expander.vue
new file mode 100644
index 00000000..6cbff1cc
--- /dev/null
+++ b/src/tools/ipv4-range-expander/ipv4-range-expander.vue
@@ -0,0 +1,110 @@
+<template>
+  <div>
+    <n-space item-style="flex:1 1 0">
+      <div>
+        <n-space item-style="flex:1 1 0">
+          <n-form-item label="Start address" v-bind="startIpValidation.attrs">
+            <n-input v-model:value="rawStartAddress" placeholder="Start IPv4 address..." />
+          </n-form-item>
+          <n-form-item label="End address" v-bind="endIpValidation.attrs">
+            <n-input v-model:value="rawEndAddress" placeholder="End IPv4 address..." />
+          </n-form-item>
+        </n-space>
+
+        <n-table v-if="showResult" data-test-id="result">
+          <thead>
+            <tr>
+              <th scope="col">&nbsp;</th>
+              <th scope="col">old value</th>
+              <th scope="col">new value</th>
+            </tr>
+          </thead>
+          <tbody>
+            <result-row
+              v-for="{ label, getOldValue, getNewValue } in calculatedValues"
+              :key="label"
+              :label="label"
+              :old-value="getOldValue(result)"
+              :new-value="getNewValue(result)"
+            />
+          </tbody>
+        </n-table>
+        <n-alert
+          v-else-if="startIpValidation.isValid && endIpValidation.isValid"
+          title="Invalid combination of start and end IPv4 address"
+          type="error"
+        >
+          <n-space vertical>
+            <n-text depth="3">
+              The end IPv4 address is lower than the start IPv4 address. This is not valid and no result could be
+              calculated. In the most cases the solution to solve this problem is to change start and end address.
+            </n-text>
+            <n-button quaternary @click="onSwitchStartEndClicked">
+              <n-icon :component="ChangeCircleOutlined" />
+              &nbsp;&nbsp;Switch start and end IPv4 address
+            </n-button>
+          </n-space>
+        </n-alert>
+      </div>
+    </n-space>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { useValidation } from '@/composable/validation';
+import { ChangeCircleOutlined } from '@vicons/material';
+import { isValidIpv4 } from '../ipv4-address-converter/ipv4-address-converter.service';
+import type { Ipv4RangeExpanderResult } from './ipv4-range-expander.types';
+import { calculateCidr } from './ipv4-range-expander.service';
+import ResultRow from './result-row.vue';
+
+const rawStartAddress = useStorage('ipv4-range-expander:startAddress', '192.168.1.1');
+const rawEndAddress = useStorage('ipv4-range-expander:endAddress', '192.168.6.255');
+
+const result = computed(() => calculateCidr({ startIp: rawStartAddress.value, endIp: rawEndAddress.value }));
+
+const calculatedValues: {
+  label: string;
+  getOldValue: (result: Ipv4RangeExpanderResult | undefined) => string | undefined;
+  getNewValue: (result: Ipv4RangeExpanderResult | undefined) => string | undefined;
+}[] = [
+  {
+    label: 'Start address',
+    getOldValue: () => rawStartAddress.value,
+    getNewValue: (result) => result?.newStart,
+  },
+  {
+    label: 'End address',
+    getOldValue: () => rawEndAddress.value,
+    getNewValue: (result) => result?.newEnd,
+  },
+  {
+    label: 'Addresses in range',
+    getOldValue: (result) => result?.oldSize?.toLocaleString(),
+    getNewValue: (result) => result?.newSize?.toLocaleString(),
+  },
+  {
+    label: 'CIDR',
+    getOldValue: () => '',
+    getNewValue: (result) => result?.newCidr,
+  },
+];
+
+const showResult = computed(() => endIpValidation.isValid && startIpValidation.isValid && result.value !== undefined);
+const startIpValidation = useValidation({
+  source: rawStartAddress,
+  rules: [{ message: 'Invalid ipv4 address', validator: (ip) => isValidIpv4({ ip }) }],
+});
+const endIpValidation = useValidation({
+  source: rawEndAddress,
+  rules: [{ message: 'Invalid ipv4 address', validator: (ip) => isValidIpv4({ ip }) }],
+});
+
+function onSwitchStartEndClicked() {
+  const tmpStart = rawStartAddress.value;
+  rawStartAddress.value = rawEndAddress.value;
+  rawEndAddress.value = tmpStart;
+}
+</script>
+
+<style lang="less" scoped></style>
diff --git a/src/tools/ipv4-range-expander/result-row.vue b/src/tools/ipv4-range-expander/result-row.vue
new file mode 100644
index 00000000..b1782fea
--- /dev/null
+++ b/src/tools/ipv4-range-expander/result-row.vue
@@ -0,0 +1,27 @@
+<template>
+  <tr>
+    <td>
+      <n-text strong>{{ label }}</n-text>
+    </td>
+    <td :data-test-id="testId + '.old'"><span-copyable :value="oldValue" class="monospace" /></td>
+    <td :data-test-id="testId + '.new'">
+      <span-copyable :value="newValue"></span-copyable>
+    </td>
+  </tr>
+</template>
+
+<script setup lang="ts">
+import SpanCopyable from '@/components/SpanCopyable.vue';
+import _ from 'lodash';
+
+const props = withDefaults(defineProps<{ label: string; oldValue?: string; newValue?: string }>(), {
+  label: '',
+  oldValue: '',
+  newValue: '',
+});
+const { label, oldValue, newValue } = toRefs(props);
+
+const testId = computed(() => _.kebabCase(label.value));
+</script>
+
+<style scoped lang="less"></style>
diff --git a/src/tools/ipv4-subnet-calculator/ipv4-subnet-calculator.vue b/src/tools/ipv4-subnet-calculator/ipv4-subnet-calculator.vue
index 7b488c9c..48b96fa1 100644
--- a/src/tools/ipv4-subnet-calculator/ipv4-subnet-calculator.vue
+++ b/src/tools/ipv4-subnet-calculator/ipv4-subnet-calculator.vue
@@ -12,7 +12,7 @@
               <n-text strong>{{ label }}</n-text>
             </td>
             <td>
-              <copyable-ip-like v-if="getValue(networkInfo)" :ip="getValue(networkInfo)"></copyable-ip-like>
+              <span-copyable v-if="getValue(networkInfo)" :value="getValue(networkInfo)"></span-copyable>
               <n-text v-else depth="3">{{ undefinedFallback }}</n-text>
             </td>
           </tr>
@@ -41,8 +41,8 @@ import { useValidation } from '@/composable/validation';
 import { isNotThrowing } from '@/utils/boolean';
 import { useStorage } from '@vueuse/core';
 import { ArrowLeft, ArrowRight } from '@vicons/tabler';
+import SpanCopyable from '@/components/SpanCopyable.vue';
 import { getIPClass } from './ipv4-subnet-calculator.models';
-import CopyableIpLike from './copyable-ip-like.vue';
 
 const ip = useStorage('ipv4-subnet-calculator:ip', '192.168.0.1/24');